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e0c211bb2e
Conflicts: GUILE-VERSION libguile/posix.c module/ice-9/eval.scm test-suite/tests/cse.test
156 lines
4 KiB
C
156 lines
4 KiB
C
/* Copyright (C) 2000, 2001, 2006, 2008, 2009, 2011, 2012 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libguile/_scm.h"
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#include "libguile/eval.h"
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#include "libguile/feature.h"
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#include "libguile/gc.h"
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#include "libguile/numbers.h"
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#include "libguile/ports.h"
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#include "libguile/root.h"
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#include "libguile/strings.h"
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#include "libguile/struct.h"
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#include "libguile/validate.h"
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#include "libguile/values.h"
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SCM scm_values_vtable;
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/* OBJ must be a values object containing exactly two values.
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scm_i_extract_values_2 puts those two values into *p1 and *p2. */
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void
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scm_i_extract_values_2 (SCM obj, SCM *p1, SCM *p2)
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{
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SCM values;
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SCM_ASSERT_TYPE (SCM_VALUESP (obj), obj, SCM_ARG1,
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"scm_i_extract_values_2", "values");
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values = scm_struct_ref (obj, SCM_INUM0);
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if (scm_ilength (values) != 2)
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scm_wrong_type_arg_msg
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("scm_i_extract_values_2", SCM_ARG1, obj,
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"a values object containing exactly two values");
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*p1 = SCM_CAR (values);
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*p2 = SCM_CADR (values);
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}
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static SCM
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print_values (SCM obj, SCM pwps)
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{
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SCM values = scm_struct_ref (obj, SCM_INUM0);
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SCM port = SCM_PORT_WITH_PS_PORT (pwps);
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scm_print_state *ps = SCM_PRINT_STATE (SCM_PORT_WITH_PS_PS (pwps));
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scm_puts_unlocked ("#<values ", port);
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scm_iprin1 (values, port, ps);
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scm_puts_unlocked (">", port);
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return SCM_UNSPECIFIED;
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}
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size_t
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scm_c_nvalues (SCM obj)
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{
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if (SCM_LIKELY (SCM_VALUESP (obj)))
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return scm_ilength (scm_struct_ref (obj, SCM_INUM0));
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else
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return 1;
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}
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SCM
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scm_c_value_ref (SCM obj, size_t idx)
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{
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if (SCM_LIKELY (SCM_VALUESP (obj)))
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{
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SCM values = scm_struct_ref (obj, SCM_INUM0);
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size_t i = idx;
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while (SCM_LIKELY (scm_is_pair (values)))
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{
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if (i == 0)
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return SCM_CAR (values);
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values = SCM_CDR (values);
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i--;
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}
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}
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else if (idx == 0)
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return obj;
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scm_error (scm_out_of_range_key,
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"scm_c_value_ref",
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"Too few values in ~S to access index ~S",
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scm_list_2 (obj, scm_from_size_t (idx)),
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scm_list_1 (scm_from_size_t (idx)));
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}
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SCM_DEFINE (scm_values, "values", 0, 0, 1,
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(SCM args),
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"Delivers all of its arguments to its continuation. Except for\n"
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"continuations created by the @code{call-with-values} procedure,\n"
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"all continuations take exactly one value. The effect of\n"
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"passing no value or more than one value to continuations that\n"
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"were not created by @code{call-with-values} is unspecified.")
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#define FUNC_NAME s_scm_values
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{
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long n;
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SCM result;
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SCM_VALIDATE_LIST_COPYLEN (1, args, n);
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if (n == 1)
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result = SCM_CAR (args);
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else
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result = scm_c_make_struct (scm_values_vtable, 0, 1, SCM_UNPACK (args));
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return result;
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}
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#undef FUNC_NAME
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SCM
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scm_c_values (SCM *base, size_t nvalues)
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{
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SCM ret, *walk;
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if (nvalues == 1)
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return *base;
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for (ret = SCM_EOL, walk = base + nvalues - 1; walk >= base; walk--)
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ret = scm_cons (*walk, ret);
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return scm_values (ret);
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}
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void
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scm_init_values (void)
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{
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SCM print = scm_c_define_gsubr ("%print-values", 2, 0, 0, print_values);
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scm_values_vtable = scm_make_vtable (scm_from_locale_string ("pr"), print);
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scm_add_feature ("values");
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#include "libguile/values.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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